textproduct: Quad Cities

KEY MESSAGES

- A storm system with widespread showers and isolated thunderstorms will slowly move through the area this morning. Heavy rainfall with the potential for some localized flash flooding will be possible in eastern Iowa south of Interstate 80.

- Quiet cooler weather Thursday into Friday, as high pressure passes overhead.

- Another stretch of potentially active weather this weekend into the next work week, bringing daily chances of precipitation for some.

SHORT TERM /THROUGH TONIGHT/

Issued at 313 AM CDT Wed Sep 9 2026

Warm advection ahead of a cold front continues to support widespread showers and isolated storms across the area early this morning. An estimated 0.5-3.0 inches of rainfall has already fallen along and north of Highway 34, with the highest amounts in eastern Iowa near the Interstate 380/Highway 218 corridor. Additional rainfall of 0.5- 1.5 inches is expected along and south of Highway 30 through mid- morning as PWATs maximize near 2.00+ inches along the boundary. This is especially true along the Interstate 80 corridor where a training line of thunderstorms extends from central Iowa to eastern Nebraska. While weaker instability in eastern Iowa will lead to these thunderstorms weakening as they enter the area, heavy rain with rainfall rates will remain possible, leading to localized areas of heavy rain, which may result in isolated flash flooding.

As the axis of showers and storms drifts southward, support will decrease with the decay of the nocturnal LLJ this morning. This will result in decreasing coverage past mid-morning. By early afternoon, showers will have fully exited the area. However, cloud cover will clear more slowly, which in addition to the morning showers will help limit highs to the upper 70s to low 80s.

Following frontal passage this afternoon, dry and pleasant weather will be expected through the remainder of the day. Lows tonight will drop into the upper 50s to mid 60s.

LONG TERM /THURSDAY THROUGH TUESDAY/

Issued at 245 PM CDT Tue Sep 8 2026

Thursday and Friday...A couple of decent looking days look in store with bouts of both sfc and upper ridging allowing for dry and near seasonable conditions.

Saturday through Monday...The latest suite of medium range models continue to suggest flattening flow again embedded with passing short wave and associated sfc fronts making for a potentially active period. First in line may be Saturday with a sfc front getting swept through the area off a passing LLVL cyclone along the US/Canadian border. Then maybe a short lull for Sunday before signs of a digging longer wave trof acrs the western high plains arching steering flow in a southwesterly fashion toward the upper midwest. This could make for another unsettles period for Sunday night into early next week if this pattern verifies.

AVIATION /12Z TAFS THROUGH 12Z THURSDAY/

Issued at 700 AM CDT Wed Sep 9 2026

Conditions will gradually improve from MVFR or lower conditions to VFR through the TAF period. Showers and isolated thunderstorms continue to move eastward this morning as the axis of precipitation shifts southward with a cold front. Across the northern terminals (DBQ/CID), IFR CIGS are possible behind the showers, with highest confidence in IFR conditions at DBQ, where showers have ended. At all other terminals (CID/MLI/BRL), MVFR or lower VSBYs will continue to be possible with any showers or storms. BRL is the only terminal with chances for thunderstorms, with greatest chances in the next couple hours before upper level support weakens. From 09/18Z onward, VFR conditions are expected. There is a signal towards the last 6 hours of the period for fog at BRL, but low confidence has kept it from this issuance.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.